I've used another brand (won't mention it) for years. Neptune have good probes, was easy to calabrate to my DA controller system. Most probes only last about a year.will see if this last as long. (Posted on 1/13/2015)

good product Review by Anthony

Product Rating:

Works good just wish it lasted longer than 12 months (Posted on 11/28/2014)

Quality Review by Carol

I have had other ph probes and can tell you, there is a difference, this probe is quality. Neptune puts out great products. (Posted on 5/10/2011)

Ok I guess Review by Cablebox615

You will need two different Calibration fluids. Like for reef tanks, I would suggest using the 7.0 and the 10.0. It works great with my Aquacontroller Apex. (Posted on 1/6/2010)

I've used another brand (won't mention it) for years. Neptune have good probes, was easy to calabrate to my DA controller system. Most probes only last about a year.will see if this last as long. (Posted on 1/13/2015)